package com.water.dmdb.util;

import java.util.HashMap;
import java.util.Map;

public class HashDemoTest {
    public static void main(String[] args) {
        Map<String,Object> map = new HashMap<>();
        map.put("","");
        int hashCode = "12".hashCode();
        String s = Integer.toBinaryString(hashCode);
        //1011100011101011101001
        int i = (16 - 1) & hashCode;
        System.out.println(i);

    }
}
